Performance Tests
4- 128
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
k. Set the Record Length to 4000.
l. From the tool bar, touch the Meas button and select the Histo tab.
m. Press the Mean, Std Dev,andStatistics buttons.
n. Set the Measurement Statistics to Mean and press the Setup button.
o. Press the Histogram button, and set the Histogram Mode to Vert,the
Display to On, and set the Source to Channel 1.
p. Press the Advanced button.
q. Press the Close button.
2. Follow this procedure to make the Optical Noise checks:
a. From the tool bar, touch Vert and select the Chan 1 tab.
b. Select a calibrated Wavelength.
c. Press the Close button.
d. Change the Horizontal Scale and then return the S cale to 20 ns/div.
e. Confirm Optical Noise is within limits: After a few seconds, note the
Mean and the Std Dev results displayed for the selected wavelength. The
mean of the histogram is the dark level value and the standard deviation
of the histogram is the maximum RMS optical noise value. Refer to
Table 4--14. Enter the value in the test record.
f. Repeat steps a through e for each available wavelength.
Table 4- 14: Optical noise limits
Instrument Maximum optical noise, std
CSA7404B
1550 and 1310 nm
850 nm
780 nm
4.35 W
5.35 W
5.85 W
3. Disconnect the hookup: Disconnect the adapters from the inputs and outputs.
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